//引入核心框架
import Vue from 'vue';
//插件的包
import PerfectScrollbar from 'perfect-scrollbar';
//对应的css
import "perfect-scrollbar/css/perfect-scrollbar.css";

/**
 * @description 为自定义滚动条全局注入自定义指令。自动判断该更新PerfectScrollbar还是创建它
 * @param {Element} el - 必填。dom元素
 */
const el_scrollBar = (el) => {
    //在元素上加点私货，名字随便取，确保不会和已有属性重复即可，我取名叫做_ps_
    if (el._ps_ instanceof PerfectScrollbar) {
        el._ps_.update();
    } else {
        //el上挂一份属性
        el._ps_ = new PerfectScrollbar(el, { suppressScrollX: true });
    }
};

Vue.directive("scrollBar",{
    inserted(el, binding){
        const { value } = binding;
        if(value === "你喜欢的标记"){
            el = el.querySelector(".el-table__body-wrapper");
            if(!el){
                return console.warn("未发现className为el-table__body-wrapper的dom");
            }
        }
        const rules = ["fixed", "absolute", "relative"];
            if (!rules.includes(window.getComputedStyle(el, null).position)) {
                console.error(`perfect-scrollbar所在的容器的position属性必须是以下之一：${rules.join("、")}`)
            }
            el_scrollBar(el);
    },
    componentUpdated(el, binding, vnode) {
        const { value } = binding;
        if (value === "你喜欢的标记") {
            el = el.querySelector(".el-table__body-wrapper");
            if(!el){
                return console.warn("未发现className为el-table__body-wrapper的dom");
            }
        }
        vnode.context.$nextTick(
            () => {
                try {
                    el_scrollBar(el);
                } catch (error) {
                    console.error(error);
                }
            }
        )
    },
})

<el-table
      :data="tableData"
      style="width: 100%"
      height="250"
      el_scrollBar="你喜欢的标记">
 ...
</el-table>

.el-table{
  // 解决table组件内容滚动时页面滚动条同步滚动
  overflow: auto;
  // 必须设置
  position: relative;
}

npm install classlist-polyfill --save

//引入核心框架
import Vue from 'vue';
//classList的垫片
import "classlist-polyfill";
//插件的包
import PerfectScrollbar from 'perfect-scrollbar';
//对应的css
import "perfect-scrollbar/css/perfect-scrollbar.css";